A 28-year-old woman from Delhi presents on day 5 of fever with severe retro-orbital pain, myalgia, and a blanching maculopapular rash over her trunk and limbs. Her platelet count is 85,000/μL, haemoglobin 14.2 g/dL, and haematocrit 38%. Liver enzymes are mildly elevated (AST 120 U/L, ALT 95 U/L). She denies abdominal pain, bleeding manifestations, or respiratory distress. Blood pressure is 110/70 mmHg. What is the most appropriate clinical classification and immediate management?

Explanation

## Clinical Classification and Risk Stratification **Key Point:** This patient has dengue with warning signs (plasma leakage indicators), not yet severe dengue. The presence of warning signs mandates admission and close monitoring, but does not yet warrant aggressive IV resuscitation or transfusion. ### Dengue Classification Framework | Feature | Dengue Fever | Dengue with Warning Signs | Severe Dengue | |---------|--------------|---------------------------|----------------| | **Fever duration** | Days 3–7 | Days 3–7 | Days 3–7 | | **Platelet count** | Variable | <100,000/μL | <100,000/μL | | **Haematocrit rise** | <10% | 10–20% or rising trend | >20% or rapid rise | | **Plasma leakage signs** | None | Pleural effusion, ascites, pericardial effusion on imaging OR persistent vomiting, abdominal pain, lethargy, postural hypotension | Clinical shock, severe bleeding, severe organ impairment | | **Management** | Outpatient if reliable follow-up | **Admit, daily monitoring, IV fluids if unable to tolerate oral** | ICU, aggressive IV resuscitation, transfusion | **High-Yield:** Warning signs are the **early markers of plasma leakage** and dengue progression. They appear before shock develops and are the critical point for intervention to prevent severe dengue. ### This Patient's Risk Factors 1. **Platelet count 85,000/μL** — below 100,000, a warning sign threshold 2. **Haematocrit 38%** — baseline normal; no significant rise documented yet, but haematocrit trend must be monitored 3. **Mild hepatitis (AST 120, ALT 95)** — consistent with dengue but not severe 4. **Haemodynamically stable** — BP 110/70 mmHg, no postural hypotension mentioned 5. **No bleeding manifestations** — no petechiae, mucosal bleeding, or GI bleed 6. **No severe organ impairment** — no shock, no altered mental status **Clinical Pearl:** The **critical phase** of dengue (days 3–7) is when plasma leakage peaks. Patients with warning signs are at high risk of progression to shock within 24–48 hours if not monitored closely. Daily haematocrit and platelet monitoring is essential to detect rising haematocrit (even if <20% rise) and further platelet drop, which signal increasing plasma leakage. ### Management Strategy **Admission criteria met:** - Platelet count <100,000/μL - Risk of further deterioration - Need for serial monitoring **Immediate actions:** 1. Admit for observation 2. Establish IV access (do NOT transfuse unless bleeding or shock) 3. Daily haematocrit, platelet count, liver function tests 4. Encourage oral fluid intake; IV fluids only if unable to tolerate oral or signs of plasma leakage worsen 5. Educate on red-flag symptoms (persistent vomiting, severe abdominal pain, bleeding, lethargy, postural dizziness) **Platelet transfusion is NOT indicated** in the absence of active bleeding or platelet count <20,000/μL with bleeding risk. [cite:Harrison 21e Ch 197]